[EMAIL PROTECTED] wrote:
The hardware doesn't care (I'm using an MPC8347E), as far as the DMA engine is concerned these are just addresses. All of this goes to cache coherency. The map/unmap functions are supposed to ensure that data is copied and caches flushed at the right times to ensure cache coherency. So the question is this; is the dma_async_memcpy_buf_to_buf() function intended to be bi-directional and is it safe to pass it a 'src' pointer that's actually coming from the device, or does there need to be a second function for doing a copy from the device to the CPU?
The "device" is the DMA engine, thus src is inherently going to the device and dest is inherently coming from the device.
-Scott _______________________________________________ Linuxppc-embedded mailing list Linuxppc-embedded@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-embedded
